Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler

doi:10.1016/j.cjche.2022.03.022

中国化学工程学报 ›› 2023, Vol. 54 ›› Issue (2): 53-66.DOI: 10.1016/j.cjche.2022.03.022

• Full Length Article • 上一篇下一篇

Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler

Feng Jiang^1,3, Xiao Li¹, Guopeng Qi², Xiulun Li¹

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. School of Biological and Environmental Engineering, Tianjin Vocational Institute, Tianjin 300410, China;
3. Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin University, Tianjin 300350, China

收稿日期:2021-12-08 修回日期:2022-03-29 出版日期:2023-02-28 发布日期:2023-05-11
通讯作者: Feng Jiang,E-mail:jiangfeng@tju.edu.cn
基金资助:
This work is supported by the open foundation of State Key Laboratory of Chemical Engineering (SKL-ChE-18B03) and the Municipal Science and Technology Commission of Tianjin, China (2009ZCKFGX01900).

Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler

Feng Jiang^1,3, Xiao Li¹, Guopeng Qi², Xiulun Li¹

1. School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. School of Biological and Environmental Engineering, Tianjin Vocational Institute, Tianjin 300410, China;
3. Tianjin Key Laboratory of Chemical Process Safety and Equipment Technology, Tianjin University, Tianjin 300350, China

Received:2021-12-08 Revised:2022-03-29 Online:2023-02-28 Published:2023-05-11
Contact: Feng Jiang,E-mail:jiangfeng@tju.edu.cn
Supported by:
This work is supported by the open foundation of State Key Laboratory of Chemical Engineering (SKL-ChE-18B03) and the Municipal Science and Technology Commission of Tianjin, China (2009ZCKFGX01900).

摘要/Abstract

摘要： A liquid–solid circulating fluidized bed boiler is designed and built for visualization research by applying the fluidized bed heat transfer and fouling prevention technology to the water side of the boiler. Four types of engineering plastic particles with different physical properties are selected as the solid working media. The effect of particle types on the fluidization and distribution of particles in the boiler is investigated under different feedwater flow rates and amount of added particles by using the charge couple device image measurement and acquisition system. The results show that all kinds of particles can’t be normally fluidized and accumulate in the drum at low amount of added particles and feedwater flow rate. The particles with great density and low sphericity are more likely to accumulate. The average solid holdup in the riser tubes increases with the increase in feedwater flow rate and the amount of added particles. The non-uniform degree of particle distribution in the riser tubes generally decreases with the increase in feedwater flow rate and the amount of added particles. The particles with small density and settling velocity have high average solid holdup in the riser tubes under close sphericity. In generally, the smaller the density and settling velocity, the more uniform the particle distribution in the riser tubes. Three-dimensional diagrams of the non-uniform degree of particle distribution in the riser tubes of the boiler are established.

关键词: Circulating fluidized bed boiler, Particle type, Particle distribution, Visualization, Fouling prevention

Abstract: A liquid–solid circulating fluidized bed boiler is designed and built for visualization research by applying the fluidized bed heat transfer and fouling prevention technology to the water side of the boiler. Four types of engineering plastic particles with different physical properties are selected as the solid working media. The effect of particle types on the fluidization and distribution of particles in the boiler is investigated under different feedwater flow rates and amount of added particles by using the charge couple device image measurement and acquisition system. The results show that all kinds of particles can’t be normally fluidized and accumulate in the drum at low amount of added particles and feedwater flow rate. The particles with great density and low sphericity are more likely to accumulate. The average solid holdup in the riser tubes increases with the increase in feedwater flow rate and the amount of added particles. The non-uniform degree of particle distribution in the riser tubes generally decreases with the increase in feedwater flow rate and the amount of added particles. The particles with small density and settling velocity have high average solid holdup in the riser tubes under close sphericity. In generally, the smaller the density and settling velocity, the more uniform the particle distribution in the riser tubes. Three-dimensional diagrams of the non-uniform degree of particle distribution in the riser tubes of the boiler are established.

Key words: Circulating fluidized bed boiler, Particle type, Particle distribution, Visualization, Fouling prevention

Feng Jiang, Xiao Li, Guopeng Qi, Xiulun Li. Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler[J]. 中国化学工程学报, 2023, 54(2): 53-66.

Feng Jiang, Xiao Li, Guopeng Qi, Xiulun Li. Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler[J]. Chinese Journal of Chemical Engineering, 2023, 54(2): 53-66.

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Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler

Effects of particle type on the particle fluidization and distribution in a liquid–solid circulating fluidized bed boiler

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